584 COEALLINACEAE. 



Family 15. SQUAMARIACEAE. 



1. PEYSSONNELIA Decaisne, Arch. Mus. 2: 168 (as 



Peyssonellia) . 1841. 



Squamaria Zanard. Syn. Alg. Adriat. 133. 1841. Not Squamaria 



(Eivin.) Hall. 1768. 



1. Peyssonnelia rubra (Grev.) J. Ag. Sp. Alg. 2: 502. 1852. 



Zonaria rubra Grev. Trans. Linn. Soc. 15: 340. pi. 3. f. 3. 1827. 



On Valonia ventricosa under shelving rocks at low-water mark, Cave Cays, Ex- 

 uma Chain : — Bermuda ; Cuba ; and American Virgin Islands ; Mediterranean Sea. 

 Type from Greece. 



The genus Peyssonnelia is represented by other species in the Bahamas and the 

 family Squamariaceae doubtless has other generic representatives besides Peysson- 

 nelia, but the available material has not yet been studied with sufficient care to 

 warrant the publication of further determinations. 



Family 16. CORALLINACEAE. 



1. ARCHAEOLITHOTHAMNIUM Eothpl. Zeits. Deuts. Geol. 

 Ges. 43: 295. 1891. 



Sporolithon Heyd. Ber. Deuts. Bot. Ges. 15: 66. 1897. 



1. Archaeolithothamnium dimotum Fosl. & Howe, Bull. N. Y. Bot. Gard. 4: 

 128. pi. 80. f. 1; pi. 87. 1^06. 



Forming rather smooth crusts on the older parts of living corals, near low-water 

 mark, Mariguana : — Jamaica and Porto Rico. Type from Porto Rico. 



2. LITHOTHAMNIUM Philippi, Wiegm. Archiv Naturgesch. 3^: 387. 1837. 



Thallus forming smooth, thin, fragile, often ascending, 



o-^erlapping, scarcely adherent crusts 0.15-0.2 mm. 



thick. 1. L. mesomorphum ornatum. 



Thallus forming an irregularly nodulose crust 10-15 



mm. thick, 2. L. aemulans. 



1. Iiithothamnium mesomorphum ornatum Fosl, & Howe, Bull. jST. Y. Bot. 



Gard. 4: 129. pL 80. f. 2; pi. 90. f. 2. 1906. 



Low-littoral on a deeply shaded rock shelf, yellowish-rose or salmon-colored when 

 living,' Cave Cays, Exuma Chain. Type of variety from Cave Cays ; type of species 

 from Bermuda. 



2. Lithothamnium aemulans (Fosl. & Howe) Fosl. & Howe, K. Norske Vidensk. 



Selsk. Skr. 1908^: 9. 1908. 



LitJwthamnhim fruticulosum aemulans Fosl. & Howe, Bull. N. Y. Bot. 

 Gard. 4: 130. pi. 81. f. 1, 2. 1906. 



Encrusting an old conch shell, Andros : — Porto Rico. Type from San Juan, 

 Porto Rico. 



3. GONIOLITHON Fosl. K. Norske Vidensk. Selsk. Skr. 1900^: 15. 1900. 

 [Apparently not Goniolithon Fosl. loc. cit. 1898- : 5. 1898.] 



Thallus wholly and permanently crustaceous. 



Thallus commonly rather loosely attached, the margins often free and ascending ; 

 conceptacles large, mostly 0.6-1.2 mm. broad, usually with 

 long-rostrate ostioles. 1. G. soluhile. 



Thallus very firmly and persistently adherent. 



Thallus essentially smooth and plane or roughened only 

 by inequalities of substratum or by conceptacles, which 

 are 200-400 ^ in diameter. 2. O. accretum. 



